default <- function (x)
UseMethod('default', x)
first <- function(x)
x[1]
#' @export
default.logical <- first
#' @export
default.integer <- first
#' @export
default.character <- first
#' @export
default.factor <- first
#' @export
default.double <- function(x)
mean(x, na.rm=TRUE)
#' @export
default.data.frame <- identity
#' @export
default.file <- identity
#' @export
default.list <- function(x)
`if`(is.data.frame(x), default.data.frame(x),
lapply(x, default))
#' @export
default.default <- identity
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